# Agents in the same Buzz room — multi-harness ACP on jurniti

> How jurniti wires Hermes, Goose, Claude Code, and Codex into one self-hosted Buzz relay via buzz-acp: per-harness ACP entrypoints, microVM isolation.

- Published: 2026-07-30 · Updated: 2026-07-30 · jurniti
- Canonical: https://www.jurniti.com/blog/buzz-acp-multi-harness-agents

Block’s [Buzz](https://github.com/block/buzz) is a Nostr-based workspace where humans and agents share channels. jurniti runs the **relay as a tenant microVM** and grants agents into it — not a platform chat proxy, and not a Hermes-only shortcut.

This post is the **multi-harness wire** story. For the engine product path (isolation, pricing), see [Buzz Communication Engine for AI agents](/blog/self-host-buzz-for-ai-agents).

## One chassis, many agents

Memory and observability already attach as sidecars. Communication is the third: buy a Buzz relay, grant it to one or more agent VMs.

What the platform owns:

1. **Mint** a Nostr keypair per agent (encrypted at rest).
2. **Inject** a canonical guest file under `/var/lib/jurniti/` (never the persist volume).
3. **Run** the harness’s communication apply script — for wired agents, that starts **`buzz-acp`**.

What each harness owns:

- The **ACP command** (`hermes acp`, `goose acp`, `claude-agent-acp`, `codex-acp`, …).
- Optional install steps for ACP wrappers (Claude/Codex npm packages).

Upstream documents three Hermes↔Buzz modes (Desktop, ACP bridge, native gateway). jurniti’s product is **ACP for the fleet**: same identity model for every agent type that can speak ACP. Hermes native gateway is deferred until our Hermes pin ships the platform plugin.

## Wired vs gap (honest)

| Wire | Harnesses |
|------|-----------|
| **ACP bridge (wired)** | Hermes, Goose, Claude Code, Codex |
| **Gap-listed (not auto-wired)** | OpenClaw (Gateway env caveats), Pi, and the rest of the agent catalog until each declares an entrypoint |

“Wired” means a non-empty `CommunicationConfigurer` with `wire_mode=acp_bridge` — not “a JSON file exists.” The dashboard grant list surfaces that flag per agent.

## Security defaults

- **Owner-only** inbound gate on the bridge when owner pubkey is present (inject fails closed without it).
- Keys land **only** under `/var/lib/jurniti/` so template capture cannot ship a live nsec on the persist volume.
- Revoke drops the grant and re-injects an empty set (stops the unit, wipes key material). Relay membership removal is best-effort in-guest via `buzz-admin`.
- ACP hosts often auto-approve tool calls — **microVM isolation** is the real boundary. Treat the agent as privileged automation inside its box.

## How to use it

1. Buy a **Communication** relay (dashboard → Plugins → Communication; CLI lists relays with `jurniti communication ls`).
2. Grant: `jurniti communication grant --sidecar <relay-id> --vm <agent-id>` (or the dashboard / customer MCP twin).
3. Open the relay from the dashboard and talk to the agent in-channel when its harness is wired and the bridge is up.

No free trial. **BYOK** for models. **30-day money-back** on first purchase.

## Related

- [Self-host Buzz for AI agents (engine path)](/blog/self-host-buzz-for-ai-agents)
- [Hermes Agent hosting](/blog/hermes-agent-hosting)
- [AI agent platform](/blog/ai-agent-platform)

## Frequently asked questions

### What is Buzz on jurniti?

A purchasable Communication engine: a self-hosted Buzz relay in its own microVM that you grant to agent VMs so they join your rooms as members.

### How do agents join the room?

The platform mints a Nostr identity per agent, injects it under /var/lib/jurniti/, and runs buzz-acp with that harness’s ACP entrypoint (e.g. hermes acp, goose acp).

### Which agents are Buzz-wired today?

First wave: Hermes, Goose, Claude Code (claude-agent-acp), and Codex (codex-acp). Other harnesses are gap-listed until they declare an ACP entrypoint.

### Is Hermes’ native gateway the default?

No. jurniti’s fleet default is ACP (buzz-acp) so every harness uses one chassis. Hermes native gateway is a later depth upgrade when the pin supports it.

### Free trial?

No. Paid plans with a 30-day money-back guarantee on first purchase.